179 results about "Projection angle" patented technology

The invention relates to a binocular stereoscopic vision three-dimensional reconstruction method and system based on a polarization state. The method comprises the following steps: acquiring polarization images of a polarization camera under different polarization degrees; according to the obtained polarization image, the angle of a normal vector is calculated based on the Fresnel theory, and the angle of the normal vector comprises the zenith angle and the azimuth angle of the surface of the object; the ambiguity of the azimuth angle is eliminated through the projection included angle of the normal vector on the YOZ plane, and mismatching is eliminated by using the angle constraint of the normal vector; and performing gradient integration on the angle of the normal vector after mismatching elimination to complete three-dimensional reconstruction. According to the method, the projection included angle is utilized to assist in judging the quadrant of the normal, so that mismatching of the corresponding points is eliminated, and the measurement efficiency is improved.

The invention relates to a body position auxiliary detection method and system based on DR equipment. The method comprises the following steps: performing coordinate alignment on pressure distribution data and three-dimensional depth information of a patient to generate an initial body position three-dimensional point cloud model; matching a corresponding reference skeleton-muscle model based on the registration information, generating a registered body position three-dimensional model through non-rigid registration, and extracting coordinates of key anatomical mark points; a target structure theoretical projection area is calculated by combining a DR equipment C arm projection angle, an angle deviation vector is acquired by comparing an actual projection boundary, and a dynamic correction mark is generated. According to the method, through space coordinate alignment, personalized model registration and real-time projection angle deviation correction, the accuracy and efficiency of body position placement are remarkably improved, radiation exposure caused by repeated shooting is reduced, and therefore the medical image quality and diagnosis reliability are remarkably improved.

The invention belongs to the field of image processing, and provides a projection image automatic correction method and system based on deep learning, and the method comprises the steps: controlling a projector to output a preset test image; acquiring a first image of a user at a viewing angle by the mobile terminal; acquiring a second image at a projection angle by a shooting device of the projector; extracting features and predicting adjustment parameters for projection correction based on a projection image correction model of deep learning; the adjustment parameters are issued to the projector through a network; and performing pre-distortion processing on an image signal to be projected based on the geometric mapping parameter, and performing pixel-level adjustment of brightness and color based on the compensation parameter to generate a corrected projection output image. According to the method, the usability and accuracy of projection image correction can be improved.

The invention relates to an automatic correction method for a projector, and the method comprises the steps: transmitting a projection instruction to the projector, and controlling the projector to project a preset pattern; receiving a preset pattern shot by the camera in real time, and identifying feature points of the preset pattern; calculating a deviation angle of the preset pattern according to the feature points, and judging whether the deviation angle exceeds a preset angle threshold value or not; if yes, an angle adjusting instruction is sent to the holder, and the holder is controlled to adjust the projection angle of the projector. According to the technical scheme, through the automation technology, the problems that manual placement is poor in consistency, calibration time is long and the like can be effectively solved. The automatic calibration system can monitor the postures of the projectors in real time and automatically adjust the projection angle and position through an accurate sensor and an intelligent algorithm, it is ensured that calibration parameters of all the projectors are accurate and consistent, and the efficiency and the yield of a production line are greatly improved. Meanwhile, the automatic system can reduce errors caused by manual operation and improve the consistency and quality of products.

The invention relates to the technical field of projection virtual-real fusion, and particularly discloses an exhibition hall virtual-real fusion interaction system based on dynamic light field projection, and the system comprises a multi-modal heterogeneous data fusion module which is used for obtaining multi-modal heterogeneous data of visitors and carrying out the fitting of the multi-modal heterogeneous data; the dynamic light field real-time rendering module is used for simulating attenuation and scattering of light in a complex medium of an exhibition hall; the millimeter-level space positioning and tracking module is used for realizing real-time positioning of the moving target according to the fused multi-modal heterogeneous data; the intelligent semantic interaction decision module is used for generating a semantic interaction instruction according to the fused multi-modal heterogeneous data and the real-time positioning result of the moving target; and the adaptive projection regulation and control module is used for adjusting the projection angle and brightness according to the semantic interaction instruction, and dynamically adjusting the light path output by the dynamic light field real-time rendering module according to the environmental parameters of the exhibition hall so as to realize fusion display. According to the invention, high-precision and intelligent virtual-real fusion interaction experience can be provided for the exhibition hall.

The invention discloses an image enhancement processing method and system for an unmanned aerial vehicle monitoring video stream, and relates to the technical field of data processing, and the method comprises the steps: responding to a triggering instruction that an unmanned aerial vehicle enters a hovering verification state, extracting a current exposure line index, and resolving a target light beam projection angle corresponding to the current exposure line index, generating a scanning driving signal based on the linkage mapping relation of the two, performing line-by-line scanning exposure, and limiting the space coverage range of the physical projection light beam in a physical space slice corresponding to a pixel line which is currently in an exposure opening state, so that environmental near-field suspended particles outside the physical space slice are kept in a non-illumination state; and collecting the optical signal reflected by the physical space slice, and generating an enhanced video frame for suppressing near-field scattering interference. According to the application, the airborne linear light source and the exposure line are synchronously scanned, and the light beam coverage range is strictly limited in the physical space slice corresponding to the current exposure line, so that the near-field dust does not generate scattered light because the near-field dust is not illuminated.

The invention provides a projection lamp shadow effect intelligent adjustment method based on artificial intelligence, and the method comprises the steps: obtaining the material type and reflection coefficient of the wall surface of each region of an exhibition space through a pre-established wall surface material database, carrying out the classification processing according to the reflection characteristics of different materials, and obtaining a material reflection distribution diagram; acquiring light intensity distribution in the space based on stray light distribution characteristics, performing gridding decomposition on the light intensity distribution, and obtaining light intensity and light field distribution uniformity of each grid area through numerical integration; according to the adjusted projection angle and light source position, generating a control parameter for the projection equipment, adjusting the output intensity and direction of the projection light source, and obtaining the light distribution intensity after the control parameter of the projection equipment is adjusted; and if the contrast ratio and the color deviation value of the detail area do not meet the preset standard, optimizing the light source control parameters through an ambient light compensation mechanism in combination with the accumulated intensity data of the space corner to obtain a light compensation result.

The present invention relates to the field of atmosphere lamps, and in particular to a multi-meteor projection structure, a multi-meteor starry sky lamp and a multi-meteor projection control method. The multi-meteor projection structure comprises a plurality of light path structures; light rays generated by first light sources can sequentially pass through intersection points, first convex lenses and prisms, and are then projected to the outside; light spots formed by the light rays passing through the intersection points move along with the movement of the intersection points, and are amplified by the first convex lenses, the projection angle is changed by the prisms, and the meteor effect can be formed on the ceiling and / or the wall; and the light rays generated by the multiple first light sources can achieve the effect of generating multiple meteors at the same time by means of the respectively corresponding light path structures. By adjusting the rotation speed of a rotating disc and permutation and combination of the projection directions of multiple groups of first slits, second slits and prisms, a user can obtain numerous gorgeous and unduplicated meteor effects, and compared with a single-meteor effect, the user experience is improved to obtain a qualitative leap.

The application provides an irradiation angle adjusting component and an angle-adjustable lamp. The irradiation angle adjusting component comprises a support, a light source and an optical component. The light source emits light, the light is at least partially incident into the optical component, and the light is redirected and emitted out through the optical component. The light source and the optical component are arranged on the support, and at least one of the light source and the optical component can rotate and / or swing relative to the support, so as to change the light projection angle of the light emitted out by the optical component. The irradiation angle adjusting component can improve the universality on the basis of ensuring the heat dissipation effect.

The utility model belongs to the field of projector supports, and particularly relates to a liftable and rotatable data visualization projector support, which comprises a projector mounting plate and a projector fixing bolt, the projector fixing bolt is fixed in the middle of the upper surface of the projector mounting plate, and a supporting cylinder is arranged at the bottom of the projector mounting plate. A lifting rod is movably inserted into an inner cavity of the supporting cylinder. A first gear box is mounted at the top of the supporting cylinder, and a second gear box is mounted at the top of the lifting rod; triangular supporting frames are annularly arranged at the bottom of the supporting cylinder, screw holes are formed in the bottoms of the triangular supporting frames in a penetrating mode, adjusting screw rods are in threaded connection with the interiors of the screw holes, and self-locking universal wheels are rotationally connected to the bottoms of the adjusting screw rods. According to the novel projector, the height and the horizontal irradiation angle are flexibly adjusted, the worm gear and the worm are matched to achieve self-locking performance, the lifting rod and the projector mounting plate can be locked, the projector is more stable in use, and the projection angle and height of the projector are more accurately adjusted.

The application provides a quick assembly type projector, and belongs to the field of projectors, which comprises a host computer, a bottom plate and a mounting frame, the host computer comprises a machine body shell, a projection main body is movably connected to the side of the machine body shell, and heat dissipation grilles are evenly arranged on the side of the machine body shell, the design of the storage groove and the sealing cover plate enables users to conveniently store small objects such as remote controllers and prevents loss. In addition, the design of the power socket and the isolation cover plate ensures the safety of electricity use and avoids the entry of dust and sundries. Through the modular and standardized design concept, the projector realizes quick splicing and fixing between the host computer, the bottom plate and the mounting frame. Users can easily complete the assembly work of the projector without the help of professional tools, which greatly saves time and cost. Meanwhile, through the design of the adjusting motor and the steering top plate, users can conveniently adjust the projection angle and height to meet the use requirements in different scenes.

To provide an X-ray CT apparatus capable of accurately aligning the body thickness center of a subject with the rotation center of a scanner, and to provide a control method thereof.SOLUTION: The X-ray CT apparatus includes: a bed on which a subject is placed; an X-ray source that irradiates the subject with X-rays; an X-ray detector that detects X-rays transmitted through the subject; a scanner that rotates the X-ray source and the X-ray detector around the subject; and an image generation unit that generates a tomographic image using projection images at a plurality of projection angles acquired by the scanner; a height direction error calculation unit that calculates a height direction error between the body thickness center of the subject and a rotation center of the scanner for each position in a body axis direction of the subject based on a scan plan image acquired in advance; and a bed control unit that controls the height of the bed based on the height direction error from the start to the end of the scan.SELECTED DRAWING: Figure 4

A translation scanning tomography method, device and readable storage medium, wherein the translation scanning tomography method comprises: controlling a ball tube and a detector of a digital radiographic system to move synchronously at a preset speed, controlling the digital radiographic system to expose every preset time interval, acquiring two-dimensional images collected by the detector, determining position information of each two-dimensional image according to the preset speed and the preset time interval, and obtaining a reconstructed three-dimensional image according to a projection angle of pixels in the collected two-dimensional images and the position information. The translation scanning tomography method, device and readable storage medium can reduce the complexity of the motion structure of the DR system and the high-precision requirement of the motion feedback device, and reduce the cost.

A system receives a set of two-dimensional projection images associated with respective projection angles from an imaging device. The projection images include projections of an anatomical structure, an anatomical target, and possibly fiducial markers, with a flexible elongate device disposed therein. The system can reconstruct a three-dimensional image from the set of two-dimensional projection images. In some examples, prior to reconstruction, the system can detect and repair pixels (within the projection images) associated with the fiducial markers, the flexible elongate device, and / or other objects. The system can enhance the reconstruction using a style transfer model. The system or another system can train the style transfer model by generating two-dimensional projections for a training set based on three-dimensional ground truth images.

To reduce a situation where geometric correction frequently changes unintentionally.SOLUTION: A correction method includes: when a projection angle that is an angle formed by a horizontal plane and a projection direction of a projector is an angle within a first range, applying first geometric correction for correcting distortion of an image projected on a first projection surface from the projector; when the projection angle is an angle within a second range different from the first range, applying second geometric correction for correcting distortion of an image projected, from the projector, on a second projection surface intersecting the first projection surface; when the projection angle changes from the angle within the first range to an angle within a third range that is a range between the first range and the second range, applying the first geometric correction; and when the projection angle changes from the angle within the second range to the angle within the third range, applying the second geometric correction.SELECTED DRAWING: Figure 3

The invention discloses a holographic projection exhibition method and system of an automobile, electronic equipment and a medium, and relates to the technical field of image processing. The method comprises the steps of obtaining structural data of a to-be-exhibited vehicle, and constructing a three-dimensional model of the to-be-exhibited vehicle based on the structural data; performing optical analysis processing on the three-dimensional model to obtain transmittance information, and generating a reference holographic image of the to-be-exhibited vehicle according to the transmittance information; obtaining position data of a target audience, and determining a relative position relationship between the target audience and the holographic image based on the position data; determining a projection angle and a projection proportion of the reference holographic image according to the relative position relation; and adjusting the reference holographic image according to the projection angle and the projection proportion to obtain a target holographic image of the to-be-exhibited vehicle. By implementing the technical scheme provided by the invention, the effect of dynamically adjusting the holographic projection of the automobile to improve the exhibition comprehensiveness is achieved.

This invention provides a proton imaging method and imaging device, applicable to the fields of proton imaging technology and signal processing technology, particularly in the field of particle radiation imaging technology. The method includes: determining a virtual source position based on an initial two-dimensional dose distribution of a proton beam acquired without an imaging object; obtaining multiple sub-beam propagation paths from the virtual source position to the multiple predetermined sub-beam center positions based on the virtual source position and multiple predetermined sub-beam center positions on a predetermined plane; obtaining sub-beam data pairs corresponding to the sub-beam propagation paths and the two-dimensional dose distribution based on the two-dimensional dose distribution and the lateral distribution components determined along the sub-beam propagation paths; obtaining multiple water equivalent path lengths corresponding to at least one projection angle through an iterative algorithm based on the multiple sub-beam data pairs corresponding to at least one projection angle; and performing image reconstruction based on the multiple water equivalent path lengths corresponding to at least one projection angle to obtain a target image of the imaging object.

The present disclosure provides an image reconstruction method, device, electronic equipment and storage medium, the image reconstruction method comprising: acquiring a compressed image of a detection object with respect to a projection plane; processing at least one of two-dimensional position information, texture information and depth information included in the compressed image based on a conversion relationship to obtain three-dimensional information, the conversion relationship being determined according to extreme position information of the two-dimensional position information with respect to the projection plane or a projection angle of the two-dimensional position information with respect to the projection plane; and generating point cloud data of the detection object according to a plurality of three-dimensional information.

The invention relates to a geometric parameter estimation method for cone-beam CT, belongs to the technical field of cone-beam computed tomography, and solves the problems of high cost and low efficiency of a technical scheme for determining geometric parameters of cone-beam CT in the prior art. The geometric parameter estimation method comprises the following steps: extracting same preset sampling lines from projection images at all projection angles to obtain sinograms corresponding to all the preset sampling lines; determining a first transverse offset of each preset sampling line according to the sinogram corresponding to each preset sampling line, and performing linear fitting based on the first transverse offset of each preset sampling line to obtain a torsion angle of the cone beam CT; and performing rotation correction on the projection images at each projection angle by using the torsion angle of the cone beam CT, extracting a sinogram corresponding to the center line from the projection images at each projection angle after rotation correction, and taking the transverse offset of the center line as the transverse offset estimation value of the cone beam CT. And the geometric parameters of the cone beam CT can be quickly estimated.

The utility model discloses a projector horizontal fixing device which comprises a fixing mechanism, the bottom end of the fixing mechanism is connected with a horizontal adjusting mechanism, and the bottom end of the horizontal adjusting mechanism is connected with a supporting and positioning mechanism. According to the utility model, the distance between the front surface of the fixed disc and the projection wall surface is sensed in an infrared manner through two infrared sensors fixed on one side of the fixed disc, and the output end of a second motor fixed at the bottom end of a connecting frame drives an adjusting gear to rotate, so that an adjusting gear ring drives the fixed disc to rotate along a supporting disc; the fixing disc drives the projector to adjust and rotate to directly face the projection wall, the positioning gear ring meshed with the outer wall of the tooth surface of the positioning gear drives the supporting disc to rotate, the supporting disc drives the fixing disc to adjust the angle, the angle of the projector can be conveniently adjusted to the horizontal position, and the projection level rate of the projector is increased; the projection angle influence problem caused by a special environment or an outdoor environment is avoided.

The utility model discloses a kind of suspension type multidimensional adjustable projectors, including projector and inverted recess type frame, the middle part of the outer surface of the front end of projector is provided with lens, the middle part of the outer surface of inverted recess type frame upper end is installed with projection direction adjusting assembly, the side of projection direction adjusting assembly is provided with dustproof structure, the bottom of the outer surface of inverted recess type frame right side is installed with projection angle adjusting assembly, the middle part of the outer surface of projector left end is fixedly installed with first driven shaft, and the first driven shaft is connected with inverted recess type frame left lower portion. The utility model is projected by the projection angle adjusting assembly of being set, the angle of projector is conveniently adjusted, the projection direction adjusting assembly of being set is conveniently adjusted, the direction of projector is projected, the dustproof structure of being set is conveniently protected lens when projector is not used, reduce the accumulation of dust.

The invention provides an image correction method and a double-projection imaging system, and relates to the technical field of images, in particular to the technical field of image correction. According to the method, a first projection image and a second projection image of a target object under a target projection angle can be acquired, scattering correction is performed on the first projection image, and a corrected image under the target projection angle is determined based on the first projection image after scattering correction and the second projection image of the target object under the target projection angle. Wherein the target projection angle is a projection angle within a target projection angle range, the first projection image comprises a shadow area formed after shielding of the first BSA, and the target projection angle range is a projection angle range where the first projection group and the second projection group are overlapped. According to the method, the phenomenon of shielding artifacts of the image in the reconstruction process can be effectively reduced.

1. The name of this design product: the main body of the beam projector. 2. Purpose of this product: This product and its main body are used for light beam projection. It can move autonomously and its projection angle can be adjusted within the range of 0-90 degrees. 3. The key design point of this design product is the shape of the part represented by the solid line. 4. The picture or photo that best illustrates the design points: Stereoscopic drawing 1. 5. Other circumstances that require explanation Other explanations: This design is a partial design, in which the parts indicated by the dotted lines in each view do not fall within the scope of protection required; the part indicated by the number A in the three-dimensional figure 1 is transparent.

The present invention relates to the field of aviation technology, and discloses a ground measurement method, device, and medium for the deflection angle of an aircraft rudder. The method comprises establishing a coordinate system; selecting two points A and B as marks on the lower surface of the rudder, and recording the distance between the two points A and B; recording the projection points A' and B' of the two points A and B on the horizontal plane, recording the distance between A' and B', and calculating the angle between the projection line and the second vertical plane, and calculating the calculated angle, recording the calculated angle before the rudder deflection and the calculated angle after the deflection, and calculating the deflection angle. The device comprises a coordinate system establishment mechanism, a measuring mechanism, a storage unit, and a calculation unit. By establishing a three-dimensional coordinate system, the rudder deflection angle is calculated in combination with the change in the projection angle of the measuring point, which is applicable to ground conditions and improves the convenience and versatility of measurement.

Provided is an X-ray CT apparatus capable of suppressing a decrease in image quality of a tomographic image due to X-ray attenuation in a head holder or a top plate. The X-ray CT apparatus includes an X-ray source that irradiates an X-ray to a subject, an X-ray detector that detects the X-ray transmitted through the subject, a rotating plate that causes the X-ray source and the X-ray detector to rotate around the subject, an image generation section that generates a tomographic image of the subject based on a detection signal of the X-ray detector, and a controller that controls each section, in which the controller changes an irradiation condition of the X-ray irradiated from the X-ray source while the rotating plate rotates, such that an irradiation dose from a side on which a head holder or a top plate is disposed is increased in a range of a projection angle at which the X-ray passes through the head holder or the top plate.

In the disclosure, a marker projection device (100) for use in an augmented-reality system is described. The marker projection device (100) comprises a control unit that receives depth information data indicative of distances to surfaces (202A-C, 204, 206) in the environment of the marker projection device (100) and a marker image indicative of a visual appearance of a fiducial marker. Furthermore, the control unit is configured: to identify one or more potential projection surfaces (202A-C, 204, 206) in the environment using the depth information data; to select one (202B) of the one or more potential projection surfaces; to determine a projection angle (220A, 220B) for the selected projection surface; and to generate, using the depth information data and the projection angle for the selected projection surface, a projection image comprising an adapted marker image, wherein the control unit is configured to generate the adapted marker image by transforming the marker image such that geometrical proportions of the visual appearance of the fiducial marker are preserved when projected on the selected projection surface (202B). In addition, the marker projection device (100) comprises an optical projection unit that receives the projection image and is configured to generate a light projection according to the projection image.

A system and method includes identifying a first plurality of projection images of an object acquired by an imaging system, each of the first projection images associated with a respective one of a plurality of projection angles; reconstructing a three-dimensional image of the object based on the first projection image; forward-projecting the three-dimensional image at the plurality of projection angles to generate second projection images, each of the second projection images being associated with a respective one of the projection angles; determining a first CDF image for a first projection angle in the projection angles based on a first projection image in the first projection images and a second projection image in the second projection images; determining a pixel corresponding to the difference in the first CDF image; and combining the determined pixels with the first one of the first projection images to generate a first combined image.

The application relates to a method, device and medium suitable for multi-energy cone beam CT projection interpolation completion. The method comprises the following steps: acquiring low-energy projection and high-energy projection of a multi-energy cone beam CT energy spectrum imaging system; performing preliminary iterative sparse reconstruction and material decomposition on the low-energy projection and the high-energy projection respectively to obtain a base material one reconstructed image and a base material two reconstructed image; performing an image enhancement operation on the base material one reconstructed image and the base material two reconstructed image respectively, then performing forward projection, and performing weighted processing by using pre-calibrated high-low energy spectrum information to obtain low-energy complete projection data and high-energy complete projection data under full viewing angle. Therefore, the image domain sparse reconstructed image is used to guide the projection domain high-low energy projection data to perform energy spectrum interpolation completion, the problem of inconsistent high-low energy projection angles of a fast kilovoltage switching energy spectrum CBCT is solved, and the image quality and material decomposition accuracy are greatly improved.

The present invention discloses a method and device for correcting the eccentricity of a multi-tube CT device. The method includes the following steps: setting a marking point in the detection area of ​​the detection ring so that the rays emitted by the tube can cover the marking point; obtaining the projection image on the detection ring after the rays emitted by the tube cover the marking point; derivatizing the projection image of the tube, and obtaining the pixel coordinates of the area corresponding to the marking point on the projection image of the tube based on the grayscale change of the projection image of the tube; obtaining the spatial physical coordinates of the pixel coordinates on the detection ring; comparing the spatial physical coordinates with the preset coordinates of the marking point to obtain the projection angle offset of the tube; repeating the above steps to obtain the projection angle offset of each tube to perform eccentricity correction on each tube. This method is not only safe and reliable, simple and efficient, but also has higher correction accuracy; in addition, it can also be used with interface software for flexible interface display to more intuitively observe the adjustment results.

A depth data measuring head (600, 700) comprising: a structured light projection apparatus (110, 610, 710) used for projecting, under the drive of a driving apparatus (114, 314) and at different projection angles, a beam having a texture to a measured space so as to form different textures on an object to be measured; and first and second image sensors (620, 630; 720, 730) that are respectively arranged on both sides of the structured light projection apparatus (110, 610, 710), the first and second image sensors having a predetermined relative spatial position relationship and imaging the measured space at least twice so as to obtain at least two sets of images having different texture distributions, wherein the at least two sets of images are used for obtaining single-measurement depth data of the object to be measured. The structured light projection apparatus (110, 610, 710) that reflects, at different angles, structured light generated by a light source module (I) is used, so that rapid, economical and low-failure-rate multi-pattern projection is implemented. Furthermore, the structured light projection apparatus (110, 610, 710) matches multiple pairs of binocular sensors (723, 724; 733, 734) sharing a light path, thereby further shortening the frame interval and improving the quality of depth fusion data. Also disclosed is a depth data computing device and measurement method.